Gimp guiding mechanism



@ci l5, 1957 c. J. M. BENINK E'rAL 2,809,50

GIMP GUIDING mcHANIsM Filed Nov. 14., 1955 4 Sheets-Sheet l F/G. 5g

Oct 15, 1957 c. J. M. BENINK Erm. 2,809,601

GIMP GUIDING MECHNISM 4 Sheets-Sheet 2 Filed Nov. 14, 1956 [gigli/Vf Filed Nov. 14, 1956 C. J. M. BENINK I'AL GIMP GUIDING MECHANISM 4 Sheets-Sheet 5 /Nz/ENTOQS @CL 35 1957 c. J. M. BENINK ETAL 2,809,601

GIMP GUIDING MECHANISM 4 Sheets-Sheet 4 Filed Nov. 14, 1956 /NvfNro/as Uniedfs Peer@ Gnvra y"ChristiaanJoseph' Bninli, Hinriclifimger arid KarlKleerann',`4 Kaiserslautern; Pfalz; G'e'rnlriy, :assgno'rmto G; M; PfaflA-G.,"Kaiserslantern,Pfalz, -Germany Application -November 14,1956,\`.Serial No. 6225109 Claims priority, application Germany November'l'; 1955 V7y Claims. (Cl. 11i-100) The inventionfrelates to a special arrangement in `buttonh'ole sewing machines* providedfwith a'guide which -is securedQto'- a1 guide bar' `Whichis 4rriovable inthe' direction'of'feed'. The guide lbar is movediaga'inst'the eiectofi a spring-'from aipredeteri'nined yend position into a" predeterminedf'startinglpo'sition and locked priorf'to the stai-tof thesewingwo'rk. In'thearezr'of changing'of'the i"direction'of-'movem'entofthe material presser `ian'ie the;

"arrangements a'r'e only useable `formachines #Where the materialp'ressei' frame-eiects a transverse motion atthe Vreversing points(othefeedingrnovement in order-tosew 'both`ed`g'e's of the buttonhole. Theya're not-s uitabletorl modernv rapidly operati-ng machines wherefthel-fmaterial `presser'frame executes merelya reciprocatingvmovement i'the'di'refction ofthe machine arm byg shifting the moving areaofthe needle' barforseivingthetwo edges.

VIt`is an object of the invention-.to provide argimp';A guidev arrangement where the aforementioned shortcomings are" avoided and which isuniversallyl applica-ble to -machines which automatically; sew around theedgesofthebutton-V hole a plurality offtimes. In aecordancewiththefinven- VVtion' this object v is attained primarilyin that-the#V guide bar is arranged to .eiect'- aswingingfmovemenbinforder' to execute the evasion-arcofthegimp. guide around the needle at the reversing .points-of the' longitudinal-movements of thematerialpresser frame 4andis at' the same time supportedffor displacement Vlongitudinally in a'known mannegand in-thatY-thefarc of-evasion'isfadjustablefas a reslt'of theadjustability ofthe gimp guide at=thegi1ide "bar as well as by cooperation ofthe guide bar-withv abutments serving for` limiting the longitudinal-movement of saidguide bar as well'as also for theadjustment oizthe magnitude of the lateral motions, and is adjustable also in'its position relative tothe needle.

Itis a further object-of the inventionlto provide-algimp v guide Whererthe-momentrof thereleaseoi the re'turn'moltion around the needle-is primarily adjustable by'means of a cam provided-uponacontrol disc.

It is still arfurther object off the-invention` to fjournalithe guide bar in apivot-housing'provided at-1the end ofa lever pivotally. journalled in the arm of the machine.

In-accordance with a'stillfurtherobjects of the-invenaforementioned cam'by Way of aguide and transfer-lever with the aid of a pressurerbar.

Foi-theadjustment of the magnitudefofethedateraldeection of the' guide bar-it isipossible-to arrangean-adi 2,809,601 4Patented Oct. 15, 1957 Mice justbleftrnster' member' between the't controllever" and 'the transmission-levers.

In V'buttorih'ole machines whichl automatically sew around the edges of a buttonhole' a"plur'ality 'of'tini'es an electromagnetrayr'be provided which after/"therst'turn around 'the' butto'iiholeeiects thel return ofthe guidefbar 'to the starting position'for'each furthefperipheralsewing operation. The"electromagn`et may be controlledl by` a 10 swit'chwhichiisdn" turn controlled by an additional 'cam onthec'ontrol dise. y n I VFurther` features 'of the 'invention and i details' of 'the ad- `vantagesprovided"by'the'invention will appear from'the 'following description'ofV the embodiments of the". new

gimp guiding means as illustrated by the accompanying d'alWDgSWhB Fig.' 1- is an elevatinaI imens'of'the'gimp guiding means'in aecerdan'eewith. the

iiveiition' as viewed' from the operating side;

lFig`2iis`perspectivewview ofthe opposite side othe machine taken obliquely from the front end;

Fig."3 is a' plan view ofthe gimp guiding means;

Fig."4` is a partial crosssection along line IV`IVin Fig. 5 is a viewon an` enlarged scale illustrating Vthe mounting ofthe abutment discs;

vFig. 6 is a re'ar viewof the guide cam disc forthe 'single borders'titching;

Fig. 7Yis a rear view oflthe cam discrfor double-borderf stitching; r

' 'Fig 8= showstheV arrangement of the: end: switch;

Fig.` 95 is` the -arrangementot. lan electromagnet` for: re-

Y turning the guide bar of the gimp guiding -meansyand fplate l-,-standard2, arm 3-and head-4,is equipped inthe customaryY manner vvithaguidediscS for controllingV the @control movements fromthe 'heart shaped cam groove 8 longitudinal movements ofy the material presser frame 7 Whichis lprovidedfon. theimaterial presserY lever 6.` VThe n of theA guidediscA 5-aretransmitted:V fromslide- Ylever A10 which supportsa roller 9` and Whichismounted for pivotal movemenabout-a collarV screw1^1,i`by way oipushi-r'od 12 andbearing `member 13,\ to* the' material presselfilever v-The bearing member' 13?.is secured to -rod- 14 which I is-rnountedfr`upon arm 3 ofthe-machine.

0nE the .rear` surfaceofftheguidediscfS at guide .ringL-IS (Fig. 6)= is formedY inf av known@ manner -to provide the control movements for the-needle bar oscillator-L16 (Fig.- 2) to shift the area-offoperation" off theneedlelbar 117 for sewing the two edges of thebuttonhole. 'lhe com- Iponents for-transmitting these: control movements from 1 thel guide ring 15 to'theneedle bar oscillatorrlfwhichare 55 of knownconstruction are not illustrated inthedrawing to permit clearer illustration of the invention. Thevnee'dle "18; is secured to theoscil-lator bar-17.

The' material' presser lever f6`"'is'provided at-iits frontend pressure rollrsupport 22', vvhi'chhinfturn is secured totthe yfmaterial:press'erf'bar' 23 'biased by La-sp'rir1g" 24. fThel 'rearward end-25A of. thefmaterialrpresserf levervlfis enabled to cooperate with pressure screw 26 on the lifting-lever 27 forythe'.materiali presser. 'lhe'llatter'is journalled on in turn connected iniaknownmanner -with the=o`perating 1 Lifting"k lever: 27.- furlthermore supports= va'-`roller""31"'in enacting engagement ywithl a ig-move Y 32er. ther groeved fv-,cnrYefIeYerQrWhiclr is .pivotally securedto' the 'standard view bf aA buttonhole 1 sewing 'machine' for single" berde'rstitehing of the' button'holel by rounded edge on one side and an which faces the abutment V2 by means of a collar screw 34. Curve lever 33 is connected by way of a bar and a crank36 to shaft 37 which serves in a known manner for actuating the knife j provided `for cutting the bottom thread. Lifting lever 27 and thereby curve lever 33 are raised to the position illustrated in Fig. 4 by the action of aspring 38 when the v operating member is released. .o u Y o In accordance with the invention a Vgimp thread. 39 (Fig. Vl) `is fed by wayogof a thread spanner 40 to a gimp guide 41 which is adjustably secured to the end of an arm 43 by means of a screw 42. The gimp guide 41 is provided at both ends Vwith eyelet type thread guides 44 and 45 (Fig. 3). The arm 43 is'secured by means of a screw 48 in a bore 46 provided in-a chuck 47. The chuck 47 in turn is secured by means of screws 49 to a U-shaped support 50 which is mounted by means of screws 51 on a guide bar 52.

'The guide bar 52 is mounted for longitudinal and pivotal movement in the pivot housing 53 (Fig. 2) of a double armed lever 55 pivotally mounted on astud 54. j For this purpose a slot 56 is provided in the guide bar 52 which'is engaged by a pin 57 secured in a cylindrical guide member 58. This member'is pivotally mounted in a bore 59 of the pivot housing 53 and thus constitutes VtheY pivot axis of the guide bar 52. The pivot housing 53 is covered by plates 60 and 61 (Fig. 2) at the top and bottom sides 65 and to the machine arm 3 by means of screw 66. At

the upper end of arm 63 a pressure member 67 is securely held by means of a screw 68 which serves in a known manner for loosening the thread tensioner 69. A draw bar 71 is jointed by means of a collar screw 70 to lever 55 and is connected at its other end `nism of the machine.

to the starting mecha- There is furthermore secured to guide bar 52 a support 72 (Fig. 3) by means of screws 51, which presents an abutment lug 73 and a forwardly and downwardly extending arm 74 (Fig. 2). The latter is provided with a pin 76 secured in a threaded bore 75 which pin projects into a bifurcated extension 77 of the roller support 22.

Support 72 is provided with a bore 78 (Fig. 3)-Ywhich receives a guide member provided with a threaded stud 79 and retained by means of a nut 81. The guide member 80 Vcoacts with adjustable lateral abutments 82 and 83 provided in a small bearing chuck secured to the head 4 by means of screws 84 (Fig. 2). A slot 86 in the chuck 85 defines two extensions 87 and 88, each having a bore 89 (Fig. 5) which is rotatably engaged by a threaded sleeve 90 having a slot 91. The sleeves 90 are each provided with an annular groove 92 which is engaged by a safety screw 93 having a pin-like projection 94 to prevent changes in position in axial direction and also rotation of the sleeves 90. The disc shaped abutments 82 and 83 are screwed inthe threaded sleeves 90 by means of screws 95 and 96 and are each secured by means of a set Vscrew 97 and 98.

In the slot 86 between extensions 87 and 88 of the chuck 85 an abutment member 99 is disposed having a angular bar 100 presenting a longitudinal slot 101 for the adjustable mounting by means of a screw 102 on the chuck 85. The abutments 82 and 83 are somewhat attened along the side member 99 to insure against turning. Y

A further abutment disc 103 (Fig. 2) cooperates with the abutment nose 73 of the cam support 72 which disc has a bolt 104 received in an eye 105 on the chuck 85 and secured by means of a screw 106.`

'I'he guide bar 52 is biased by a spring 107 (Fig. Y2) which is hooked to lugs 108 and 109 and which are provided by means of screws 110 and 111 on the guide bar Y. 52and on head 4, respectively. The spring tends to pull the guide bar 52 either with its guide member 80 against the abutment member 99 or with its nose 73 against the abutment disc 103, depending on whether the gimp guide 41 is disposed before or behind the needle 18.

A roller 113 is mounted on a bolt 112 at the rear end of the guide bar 52 (Fig. 3) which roller is held by means of a safety ring 114. The roller 113 is associated with a slanted plane 116 (Fig. 2) provided on angular lever and as the lever 115 moves downwardly it engages the plane and moves the guide bar 52 against the bias of the spring 107 in the direction of the standard 2. The angular lever 115 is secured by means of screws 117 to the draw bai 35 which, as described above,.is actuated by the lift lever 27.

A pressure pin 119 disposed'perpendicularly to the guide bar 52 is slidably mounted in two bearing lugs or brackets 118 and 118a (Fig. 3) extending downwardly from the arm 3 of the machine and is under the pressure of a spring V120 which is wound about the pin 119` and rests with its ends against the bearing bracket 118 and against an adjusting ring 121 threaded upon the pin 119. The end of the pressure pin 119 which is remote from the guide bar 52 presses against the end of a lever 122 (Fig. l) under the pressure of spring'120, which lever is clamped with its split hub 123 by means of a screw 124 to the lower end of a pin 125 which is rotatably mounted in a portion 126 formed in the arm 3. A further lever 127 is secured by means of a screw 128 to the upper end of the pin 125, having a free end which coacts with an adjustable transfer member 129. The transfer l member 129 is provided with a slot 130 for adjusting purposes, through which adjusting screws 131 extend and complete the connection with a double armed control lever 132. The latter s rotatable about a collar screw 133 which is secured to a chuck 134 which is secured by means of screws 135 to arm 3. One arm 136 of the control lever 132 is provided with a set screw 137 to limit its areaof rotation while its other arm 138 is provided with a lug 139 (Fig. 3) which projects into the path of rotation of a conn-ol cam 140V provided on the back of the control disc 5. The cam 140 is adjustably secured to the control disc by means of screws 141 which are received in an elongated slot Y142 yof a cam support (Fig. 3) which holds the 72 against the lateral abutments 143 disposed concentrically with respect'to the axis of rotation of the control disc 5 (Fig. 6).

The guidinglever 52 is biased by a further spring 144 guide member 80 of the support Y82, 83 of the bearing chuck 85.- The spring 144 ishooked at one end to a of the needle for sewing hook 145 whichV is fastened to the guide bar 52 and with its other end it engages a lug 146 which s fastened to the lever 122 by means of screw 124.

Before sewing identical vbutton holes it is necessary to undertake the following adjusting operations:

Upon loosening screws 42 and 48 the height of the gimp guide above the material andY the distanceahead must be adjusted. Furthermore, the position of the gimp guide for sewing the left edge must be adjusted by axially moving the abutment disc 82. For this the counter screw 97 and the set screw 93 must be turned'back, whereupon the threaded sleeve 90 can be rotated. As a result the abutment disc 82 moves in a direction toward or away from the machine head 4. The adjustment of the abutment disc 83 for adjusting the gimp guide 41 forV sewing the left edge can be effected in a similar manner. The moment of the shifting of the gimp guide 41 after sewing the left edge can be adjusted by shifting the control cam 75 Furthermore,

the left button hole cord edge Y by adjustment of the abutment disc 103- on the chucl: 85. For this purpose tl1`e`scr'evv'1ll6 must'b'eI loosened whereupon the carryingbolt 104- can' b`e displacedl axially.

YFinally` there is also ithe possibility. ofac'ting the evasion path ofV the gimp guided'lldnringfthe return .movement oftheguiding lever, 52 by.. displacingthe abutment' member 99l from the. end positionato. the startingpositionas .the materialpresser frame- 7 is raised;

`:the angularleverf L-move downwardly. Asa result the VVinclined abutment plane `'116 "of" the" angular *lever 115 causes the'guiding-bar-52-to moveag'ainst the'tensiorrof the spring-107 -in-theedirection off-standard Z'while the guide member 80 slides over the rounded edge of the abutment member 99 as a result of the possibility of laterally moving the guiding bar 52. As the material presser lever 6 is released the guiding bar 52 is no longer subject to the pull of the spring 107 because the guide member 80 is pulled by spring 144 into the niche formed by the two abutments 82 and 99 and is locked. Consequently, spring 107 continues to be tensioned. With this movement of guide bar 52 the gimp guide 41 effects a movement about needle 18, thus moving from the end position, i. e. that position which is attained after sewing the right or second edge to the position in front of the needle 1S in the direction of feeding for sewing the left edge. This position is considered to be the starting position. lf the machine is now switched on in the usual manner, the material presser frame 7 begins to move in the direction of operation. At the return point of the movement of the material presser frame, i. e. at the end of the left edge, the lock on the guiding bar 52 is released by the control cam 140 on the control disc 5 by transmitting a control impulse to bar 52 by way of control lever 132, transfer levers 122 and 127 and pressure pin 119. As a result the guiding bar 52 swings laterally, permitting guide member 80 to slide from the abutment 99 and to follow the pull of spring 107. The longitudinal movement of the guide bar 52 is limited by the engagement of the abutment 103 by the lug 73. During this movement of the guide bar 52 the gimp guide 41 moves from the position behind the needle 18, as related to the new opposite feeding direction of the material presser bar 7, and location left edge, into the position in front of the needle and location right edge.

Now the right edge is sewed and the machine automatically stops with the needle raised after sewing the lock.

As the material presser frame is raised for removing the material the guide bar 52 and the gimp guide 41 are returned to the initial position as described above.

For button hole machines which automatically sew around the edges of the button hole a number of times, for example twice, an additional means is required which is constructed as described hereinafter.

In lieu of pin 112 the guide bar 52 is provided with a longer pin 147 (Fig. 10) which supports an additional roller 14S. An abutment 149 (Fig. 9) cooperates with this roller which is formed on an arm 150 of a double lever 151 which is journalled in a conformation in the arm 3 of the machine on a pin 153 to which it is fastened by means of a screw 152 and which is secured by a screw 154. The other arm 155 of lever 151 is offset and bifurcated at its end 156. A collar screw 157 engages the fork 156 to which is secured a bifurcated member 158, which in turn is provided on the armature 160 of an electromagnet 161 by means of screws 159. A pressure spring 162 is disposed between the bifurcated member 15S and the housing of the magnet.

Electromagnet 161 is provided with angular shaped mountinglugs 163, which are secured to the machine a'rm3 bymeans f screws164. y I

contrldisc 1651.(Fig. 7)"designed.for dual circum- "fei'ential' edgestit'ching .of the button hole isA providedin place of asingleY cam 140 as inthe rst` embodiment, -with two Vadjustable cams 1166-an`d 167'f'or"releasing .the locked Ypo'sitionofltheg'uide bar'52` by way ofcontrol lever132.

further adjustable cam 168 is provided having a path of-operationfinto whichextendsan abutment 170provided on one end`of an angularcontrol-lever` 169 (Fig. S); The

fV control lever.16'9 is-rotatably` vj v urnalledon a -collar screw V171 secured-to Vthelrnachine arm 3.

l path of theotherendLof--corrtrol-lever- 169 fand" the-switch l5 tV isr-seouredfto the machine arm -3 by means offscrews175.

Therangeof-movementrofthecontrollever* 169 is Ilimited -by -a1stoppin 176 onarm 3V.- The-switch-173 is connected -inseries-withtheelectromagnet 161V and is supplied-with current from a scmrceatnot'-shown);l 4

The operation of this arrangement is effected by lifting the material presser frame 7 and as in the first embodiment the guide bar 52 is moved to the starting position, thus tensioning spring 107. Upon sewing the rst cord the control cam 166 releases the guide bar 52 thus swinging the gimp cord guide about the needle.

At the end of the second edge the machine does not automatically stop, but it starts the second course around. Immediately before that the cam 168 actuates the end switch 173 by way of control lever 169, thus closing the circuit of electromagnet 161. The latter attracts and swings double armed lever 151 counterclockwise (Fig. 9). This returns the guide bar 52 and thus also the gimp guide 41 to starting position in the same manner as in the rst embodiment by means of the lift lever 27 for the material presser. The button hole is now edge stitched in the same manner a second time except that after sewing the first cord the guide bar 52 is released by the operation of cam which is displaced 180. Upon completion of the second cord and the end lock the machine stops automatically.

Having now described our invention in connection with the embodiments illustrated in the drawings we do not wish to be limited thereto but what we desire to protect by Letters Patent is set forth in the appended claims.

We claim:

1. Gimp guiding means for button hole sewing machines of the type including a needle supported by a needle bar at the head of the machine, a movable material presser frame and a reciprocating mechanism therefor, a gimp guide supported by a guide bar movable longitudinally in the direction of material feeding and having a starting position and an end position, a rst spring biasing said guide bar toward said end position, means cooperating to lock said guide bar and guide in starting position, means including said reciprocating mechanism operative to release and return said guide bar to the end position in response to reversing of movement in the direction of the material presser frame, said guide bar being supported for lateral movement and including means operative to effect an evasion arc of said gimp guide about the needle, said means comprising lateral abutment and catch means and a second spring exerting lateral pull on said guide bar coacting to retain said bar in the position for locating said gimp guide in said starting position, and end abutment means coacting With said first spring means to return said bar to the position for locating said gimp guide in said end position, said lateral abutment and catch means and said end abutment means being adjustable to vary the extent of lateral movement and forward movement, respectively, of said guide bar and said gimp guide, and said gimp guide being adjustable relatively to said guide bar for adjustment of the position of said guide relative to said needle.

2. Gimp guiding means in accordance with claim l, wherein said reciprocating mechanism includes a cam disc and a presser bar supporting said presser, said cam disc being provided with an adjustable cam member operative- Y ly connected by a lever and pin mechanism to said guide Y bar to eiect release from said catch means.

3. Gimp guiding means in accordance with claim 2, wherein said guide bar is mounted in a pivot housing supported by a two armed lever pivotally mounted on the housing of the machine. Y

4. Gimp guiding means in accordance with claim 3 including a pressure pin extending from'said guide bar transversely of the machine for engagement of a control lever which is in operative engagement with said cam disc for engagement by said adjustable cam to eiect Vrelease of said guide bar fromV locked position.

5.` Gimp guiding means in accordance with claim 4 wherein said lever and pin mechanism is associated with Y and includes an adjustable transfer member movable on a lever adapted to limit the magnitude of lateral' move ment of the pin and of said guide bar.

' 7. Gimp guiding means in accordance with claim 6,

including a switch associated with said electro magnet and an additional cam on said disc adapted to operate said switch.

References Cited in the le of this patent UNITED STATES PATENTS 458,434 Todd Aug. 25, 1891 716,338 Laubscher Dec. 16, 1902 2,533,293 Sigoda Dec. 12,V 1950 2,736,281 Beuerle Feb. 28, 1956 

